Park stove



Oct. 14, 1930. J. MAYER Er AL 1,778,330

PARK STOVE Filed Nov. 50, 1928 JUEEPH Ml? rm H i Kn m. NH YER 21 1 as? WM. Q W H 7 mm,

Patented Oct. 14, 1930 UNITED STATES PATENT OFFICE PARK STOVE Application filed November 30, 1928. Serial No. 322,718.

The present invention relates in general to open fire places, and more particularly to so-called park stoves, extensively used in community parks, camping places, beaches, etc.,

6 for cooking and frying of meals in the open. The park stove now in general useincludes a cemented base portion and a grate rigidly embedded in said base portion, a construction inducing cracking and destruction of the base after relatively short use of the stoves in such a degree that these stoves do not outlive the first real fire made therein. Such cracking of the base is due to unequal heating thereof and differences in expansion of the base and the grate during heating.

The primary object of the invention is a newand simple construction of a park stove avoiding any cracking by inducing equal heating and permitting individual expanding of grate and base, with respect to each other. Such an object, according to the invention, is achieved by constructing the base in separate parts, connecting such parts by a grated fire box of substantial rigidity, and connecting means between said box and base permitting individual expansion of fire box and base without decrease of the rigidity of the whole structure. The base preferably and according to the invention open at the sides and bottom, is furthermore according to the invention, spaced apart fromthe fire box by air spaces, permitting free air circulation between fire box and base in order to decrease heating of said base and at the same time induce equal heating thereof by hot air circulation. These objects and other objects including special and simple construction of the individual parts of the park stove will be more apparent from the following description of the invention and the drawings forming part thereof, and as more concisely pointed out in the appended claims.

In the accompanying drawings, Fig. 1 is a perspective View of the assembled park stove according to the invention;

Fig. 2 shows a top view of the stove with parts partly broken away.

Fig. 3 is a longitudinal sectional view on '50 line 33 of Fig. 2, and

F Fig. 4 is a cross section on line H of Figs. 5 and 6, are enlarged sectional views of the connection between base and grate taken on line 5-5 and 6-6 respectively of Fig. 3, and

Fig. 7 is a perspective view of the grating, forming top and bottom parts of the fire box. Fig. 8 is a sectional View of a modified form of a connection between base and grate.

The park stove as shown, embodies a concrete base 2 comprising two individual equal, but right and left handed uprights, or supporting walls 3 and 4 arranged opposite and parallel to each other, candconnected with a fire box 5 supported by and between said walls. Each of said walls 3 and 4 is recessed at the bottom part thereof and forms a twolegged skirting wall so'permitting substantial free contact of said base with its entirety with the open air, especially'as fire box5 supported in spaced relation from walls 3 and 4 provides at the inside of said walls air channels 6 and 7 for free circulation of air. Fire box 5 itself forms after assembling operations, a rigid unit open at both ends and consists of two gratings 8 and 9 arranged opposite each other atthe top and bottom parts of said box, and these gratings are spaced from each other by means of steel plates 10 and 11 arranged between said gratings. As shown in Fig. 7 the gratings 8 and 9 are castings including a number of parallel bars 12 united by two parallel longitudinal ribs 14 and these ribs at the same time serve as spacing means for said steel plates 10 and 11 with respect to each other, see Fig. 4. As shown, gratings 8 and 9 are reversed with respect to each. otherso that all said ribs 14 coact in spacing said plates. The opposite upper outside edges of plates 10 and 11 extend upwardly and sidewardly to form ear portions 15, 15 corrugated at 16 for pivotal support of cover plates 17, 17' upon a bar 18 extending through the corrugated ear portions and said cover plates include downwardly extending ears 19, 19 engaging the outside of the re. pective ear portions 15, 15', thereby holding said plates 10 and 11 rigidly in position. To connect the gratings with zoo the concrete side walls each grate includes two bars 20 of greater length bent at a right angle upwardly to form short uprights 21 extending at the side of the grate showing the ribs 14:, and these uprights 21 are provided with a screw-threaded hole 22 close to the ends thereof for screw-connection with walls 3' andl. The fire box.5 being entirely made from iron and steel respectively and directly heated by the fire expands in a higher degree than the concrete walls 3 and 4 and therefore special means are provided for at.- taching said uprights 21 to said walls to overcome undue stresses. created by difierencesin expanding during heating of the stove. T hus. walls 3 and 4 are provided with round holes 23 of substantial size in. which round metal tubes 24 of shorter length than the cross section of said walls are loosely fitted, andthesevholes 23 ,are furthermore recessed at 25 at the outer side of the walls v3 and 14 foria purpose later to be described.

Walls 3 and 4 also include elongated holes Lor slots 26 of about the same width as round holes-23 and these holes also including a recessedportion 27, support loosely fitted therein roundmetal tubes 28 equal in length to .saidroun'd tubes 24. Holes are solspaced that the screw threaded holes aligncd therewith, when gratings 8 and 9 and steel plates 10 and 11, are, assembled, and placed between I and approximately flush with the upper edge of concrete walls-3 and 4 so that screws or bolts .29, extending through tubes 24c and '28 may readily be screwed into holes22 to complete 23 and slots 26 22-inuprights 21 of the gratings 8 and 9. are fire box 5, including assembling of the stove. The vertical distance between holes23 and slots 26 is preferably so'chosen that firebox 5 may expand longitudinally about half of the length of slots 26-and during such expansion tubes 28 slide or roll in slots 26. The design of the stove assures equal heating of the walls 3 Q andt and the recessed bottom part thereof, and the air channels 6 and'7 between fire box '5 and said wallsinducea flow of the heated air around said walls. The fire box radiates heat downwardly and. from its steel plates,

and prevents by such plates direct heating 10f the concrete walls. It is ofutmost im- ,portance that walls 3 and 4: can freely move .with'respect to each other and that further-, more-a connection of said walls with the fire box-is yielding, and whilethe use of slots,

as shown in'Fig. 6, is preferred, such yield-- -ing connection may also be achieved by a "'linkconnection between one end of fire box 5 and said walls Such a construction is shown in Fig. 8 in which bar 20 of gratings S-and 9is suspended from a link 30, pivotally connected with said bar and screw 29.

Gratings 8 and G may include special means for holding plateslO and 11 against lateral .inovement and preferably, see Fig. 7 ,middle scope of the invention.

What we claim is: 1. A park stove comprising a plurality of individual supporting members arranged in spaced relationship opposite each other, a fire box interposed-between said members for spacing and supportingpurposes, and yieldingmeans to connect sa1d supporting members and said fire box to permit individual expansion of each of said supporting members and said fire box. f

2. A park stove comprising, a plurality of individual supporting andskirting walls, a fire box arranged between and spacing sa1d walls, and yielding connecting meansbetween: said firebox and said walls to permit individual expansionjof said fire box and each of said'walls. Y

3. A park stove comprisingia plurality of individual supporting and skirting walls made of concrete, an iron fire box including parallel side walls,- .said firebox being arranged between said concrete walls. for spac .ing'and supporting said walls in upright position, and yielding connectionsbetween said; fire box and; said concrete walls, said side walls of said firebox beingspaced a-substantial distance from said: concrete walls and forming open air'channelsbetween said concrete walls and said fire box.

4. A park stove comprising upright standing concrete walls arranged parallel and. op-

posite to each other and having recessed bottom portions, a fire box formed of parallel grates spaced byupright side walls, yieldingi I means connecting said grates tosaidconcrete walls and cover plates attached to the upper of sa1d grates and spaclng the upright side vwalls of'said fire box I 5. A park stove comprising:two uprighta standingconcrete walls having recessed bottom portions, a firebox supported by and between said concrete. walls and yielding connecting means betweensaid firebox and said concrete walls, said firebox including parallel i and in reversed relationshiparranged gratings, spacing plates between said gratings and spacing means integral with said gratings to space said plates with respect to each other. I f j 6. A park stovecomprising two individual upright standing concrete walls arranged parallel to each other and having recessed bottom portions, each of said concrete walls having a series ofround holes and a series of elongated horizontal slots, a fire boxjs upported between said walls having perforated extensions alignedwith saidround holes and said slots in said walls, andmeans extending through said holes and'sl'ots'into theperfora- 5 tions of said extensions for connecting and supporting said fire box with and by said 7 walls.

7. A park stove comprising a plurality of individual upright standing concretewalls arranged parallel and in spaced relationship to each other and a fire box yieldingly supported by and between said walls, said fire box including parallel in inversed relation- 10 ship arranged gratings, and spacing side walls between said gratings and said side walls having at their upper outer ends extensions interlocking with said gratings.

8. A park stove comprising a plurality of individual upright standing concrete walls arranged parallel and in spaced relationship to each other, a fire box open at opposite ends and yieldingly supported by and between said walls and in spaced relationship thereto, and

cover members for said fire box pivotally connected to the top of said fire box close to the open ends thereof for covering the top of said fire-box or closing the open ends thereof.

9. A park stove according to claim 6, in which said holes and said slots support loosely fitted therein bearing tubes and in which the connecting means fit said bearing tubes loosely to permit slight differences of expansion between the concrete walls and the fire box without shifting of said tubes in said slots. 10. A park stove, comprising a plurality of independent supporting members arranged opposite in spaced relationship to each other, and a fire box between said members to space andsupport saidmembers in upright position, said fire box having supporting connections with said supporting members in corresponding points at opposite ends and one of said connections being yielding to permit individual expansion of said supporting members and said fire box. 7

In testimony whereof we afiix our signatures.

JOSEPH MAYER. KARL MAYER. 

